| 摘要 |
PURPOSE:To improve a coercive force, by specifying the amount of an adding element M and the amount of C in a sintered magnet having a specified composition. CONSTITUTION:A sintered magnetic comprises at least one kinds of 8-30atom% Nd, Pr, Dy, Ho and Tb and at least one kind of La, Ce, Sm, Gd, Er and Y, 2-28% B, 0.02-2% C and a remaining part for Fe and impurities. In said magnet, the amount of (y) of an adding element M (at least one kind of Nb, Ti, Zr and Hf) with respect to the amount (x) of C is made to be in a range of x<=y<=(x+4). When the value of (y) is less than (x), a sufficient effect is not obtained. When the value of (y) exceeds (x+4), magnetic characteristics are lowered. The material undergoes dissolution and casting and the ingot is made to be powder. The powder obtained in this method undergoes molding and consolidation with a compressing press. Thus the permanent magnet having a large coercive force (iHc) and excellent magnetic characteristics can be obtained. |
